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Two-Chambered Heart: Definition & Anatomy

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  • 0:00 What Does the Heart Do?
  • 0:35 Chambers of the Heart
  • 1:20 Fish & the Two-Chambered Heart
  • 2:00 Lesson Summary
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Lesson Transcript
Instructor: John Williams
The 2-chambered heart is an interesting form of the primary circulatory organ and exists primarily in animals that use gills for breathing. Find out why the 2-chambered heart exists and what makes it different from other types of hearts.

What Does the Heart Do?

The heart is the primary organ for circulation in larger animal species, including human beings. The purpose of the heart is to provide force for the pumping of blood throughout the animal's body, which allows for nutrients and oxygen to be delivered to tissues and waste materials to be removed.

The heart contains cardiac muscle, which is involuntarily controlled, meaning the animal does not have conscious control over it, and works continuously throughout the life of the animal to drive circulation. This is an important function - but in different animals, can be achieved by different means.

Chambers of the Heart

Regardless of the organism, if it has a heart, then that heart will be divided into chambers, or specialized compartments. The two types of chambers are the atria - receiving chambers - and ventricles - pumping chambers.

Typically, the atria are the first stops for blood entering the heart, and the ventricles are the chambers that push blood out of the organ. The organization of these chambers will differ depending on the needs of the system, particularly as it relates to breathing and respiration. Animals with 2-chambered hearts are those that use gills to replenish oxygen in the blood supply, whereas animals that have 3- or 4-chambered hearts also contain lungs for respiration.

Fish and the 2-Chambered Heart

The circulatory and respiratory systems are closely linked. Blood circulating through the body must go through the respiratory system for gas exchange, which is just carbon dioxide exchanged for oxygen.

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